KR20220133347A - Microchip filtering equipment of machine tool coolant - Google Patents

Abstract

The present invention separates particles by supplying a vortex to a cyclone filter while fine chips are not settled by forming the vortex in cutting oil by using an injection pump and an injection nozzle on the cutting oil stored in a first storage tank to filter out fine chips included in the cutting oil recovered from a machining area of a machine tool, separates oil by using an oil filter in a second tank, and filters out smaller particles by using a ceramic filter in a third tank to supply the cutting oil to a fourth tank to reuse the cutting oil in the machine tool. Also, if particles are adsorbed onto the ceramic filter to reduce the discharge flow, the filtered cutting oil of the fourth tank flows backward to the ceramic filter to remove the adsorbed fine particles to efficiently filter out the fine chips included in the cutting oil in the machine tool for machining glass or quartz to prevent abnormal wear of the machine tool and extend the life of the ceramic filter. Also, the heights of the first, second, third, and fourth tanks are formed in a stepped shape to prevent the filtered cutting oil from overflowing into a tank when the capacity of the tank is exceeded to prevent contamination of the filtered cutting oil and minimize the installation area of a filtering device.

Description

Microchip filtering equipment of machine tool coolant

The present invention relates to a chip filtering device for a machine tool, and more particularly, to a device for filtering fine chips having a size smaller than those generated during normal metal processing.

When processing materials with high hardness such as glass or quartz in machine tools such as machining centers, fine chips in the form of powder with high hardness are generated. Because the particle size of these fine chip powders is so small, they are not sufficiently filtered by a general machine tool chip processing device for metal processing and are recycled together with the cutting oil.

Fine chips with high hardness mixed with the cutting oil are scattered with the cutting oil and penetrate into the gaps of the feed system or spindle inside the machine tool to accelerate the wear of the rotating and sliding parts, ultimately reducing the precision of the machine tool and lifespan. shorten the

In Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-207314), which is introduced as a prior art, as a chip processing device for a door-shaped machine tool, a channel-shaped cutting dust discharge path is installed on both sides of a table of the machine tool at an angle, and the cutting powder discharge path is installed. A pump is installed on one side of the , and cutting chips are collected in the chip storage by supplying cutting oil to the cutting powder discharge path using the pump. In addition, a filter is provided on one side of the chip storage unit to provide a chip container for separating chips and coolant, and the coolant collected in the chip container is transferred back to the coolant storage tank for reuse.

However, in the case of fine chips with high hardness such as glass or quartz, in the case of the chip processing apparatus of Patent Document 1, even if the cutting dust discharge path is inclined and the cutting oil is flowed using a pump, a simple channel-shaped cutting powder discharge path structure is sufficient. Fine chips with high hardness, such as glass or quartz, may be deposited or adsorbed in the chip discharging path and may not be discharged well. Moreover, fine chips such as glass or quartz are not sufficiently filtered with a simple filter, and may cause wear problems by penetrating into rotating and sliding parts of machine tools by reuse.

In addition, in Patent Document 2 (Korean Patent No. 10-1585597), which is introduced as a prior art, as a chip conveyor device, a high-pressure pump is installed after additional filtering of the coolant in the chip storage unit in which the chips separated by the chip separation unit are stored. It introduces the chip conveyor device of the high-pressure coolant supply device that supplies machine tools through the However, in the case of fine chips with high hardness, such as glass or quartz, the chip processing apparatus of Patent Document 2 may not be sufficiently filtered even after secondary filtration because the size of the chips is so fine. Therefore, by reusing coolant that has not been sufficiently filtered, it can penetrate into the rotating and sliding parts of the machine tool and cause wear problems.

Japanese Patent Laid-Open No. 200800207314 Korean Registered Patent No. 10-1585597

The present invention is to overcome the problems of the prior art as described above, and an object of the present invention is to provide a device capable of reusing the cutting oil by effectively filtering the cutting oil containing fine chips. Another object of the present invention is to minimize the installation area of the filtration device. Another object of the present invention is to realize a fine chip filtering device without clogging.

A cutting oil fine chip filtering device of a machine tool for achieving the object of the present invention as described above,

a first tank for storing cutting oil recovered from the machining area of the machine tool;

a cyclone pump for supplying the cutting oil stored in the first tank to a cyclone filter;

a cyclone filter for centrifuging and discharging particles contained in the cutting oil supplied from the cyclone pump;

a second tank receiving cutting oil from which particles are filtered from the cyclone filter;

an oil separation pump for discharging the stored cutting oil to the second tank;

an oil filter for separating and discharging oil contained in the cutting oil supplied from the oil separation pump;

a third tank receiving cutting oil from which oil is separated from the oil filter;

a ceramic transfer pump for discharging the stored cutting oil to the third tank;

a ceramic filter having a membrane structure that filters fine particles contained in the cutting oil supplied from the ceramic transfer pump;

and a fourth tank in which a coolant pump for supplying the coolant that has passed through the ceramic filter to the machine tool processing area is installed.

In a preferred embodiment, a jet pump for discharging the cutting oil stored in the first tank,

A plurality of injection nozzles installed adjacent to the bottom surface of the first tank to float the cutting oil discharged from the injection pump to the cutting oil stored in the first tank to prevent fine chips from settling on the bottom of the first tank. include more

In a preferred embodiment, the suction port of the injection pump is characterized in that it is installed at a position spaced apart from the coolant inlet.

In a preferred embodiment, a switching valve for intermittent flow of cutting oil and a flow meter for detecting the flow rate of cutting oil are installed on a pipe connected from the ceramic filter to the fourth tank, and the outlet pipe of the ceramic filter is provided with the fourth tank. A backwash pump is installed that supplies the coolant in the tank in the reverse flow direction of the ceramic filter and discharges it to the coolant tank upstream from the fourth tank through the backwash pipe, and the flow rate of the coolant detected through the flow meter is a predetermined flow rate. It further includes a control unit that closes the switching valve when less than the supply of cutting oil to the fourth tank, and operates the backwash pump at the same time.

In a preferred embodiment, on the backwash pipe, when the backwash pump is operated by the controller, the cutting oil that flows back through the ceramic filter is switched to be discharged to the first tank, and when the backwash pump is not operated, the ceramic It is characterized in that a three-way valve that is switched to drain the overflowing cutting oil that does not pass through the ceramic filter in excess of the filtration capacity of the filter to the third tank is installed.

In a preferred embodiment, the backwash pipe is connected to the third tank.

In a preferred embodiment, the control unit closes the selector valve only for a predetermined time when the flow rate of the cutting oil detected through the flow meter is less than the predetermined flow rate, operates the backwash pump, and removes the three-way valve. It is characterized in that it is switched in the direction of one tank.

In a preferred embodiment, a drain tank from which the oil separated from the oil filter is discharged is installed in the oil filter, and a shut-off valve is installed between the oil filter and the drain tank.

In a preferred embodiment, at the inlet side of the oil filter, when the pressure of the cutting oil supplied from the oil separation pump exceeds a predetermined pressure, a first part of the cutting oil supplied to the oil separation pump is discharged to the second tank. It is characterized in that a drain valve is installed.

In a preferred embodiment, a second drain valve for draining the cutting oil inside the oil filter to the second tank is installed at the bottom of the oil filter.

In a preferred embodiment, a pressure gauge for detecting the pressure of the cutting oil is installed on the pipe between the ceramic filter and the fourth tank.

In a preferred embodiment, a height h1 of a bulkhead of the first tank adjacent to the second tank is lower than a height h2 of a bulkhead of the second tank adjacent to the second tank, and a bulkhead of the second tank adjacent to the third tank. height h2 is lower than the height h3 of the bulkhead of the adjacent third tank, and the height h3 of the bulkhead of the third tank adjacent to the fourth tank is the height h4 of the bulkhead of the adjacent fourth tank ) is characterized in that it is formed lower than that.

The present invention can effectively filter fine chips with high hardness, such as glass or quartz, in cutting oil to prevent internal wear of the machine tool due to the penetration of the fine chips.

In addition, the present invention minimizes the installation area of the filtration device.

In addition, the present invention can extend the life of the ceramic filter as well as implement a fine chip filtration device without clogging.

1 is a circuit diagram of a cutting oil filtering device according to an embodiment of the present invention.
Figure 2 is an embodiment of the present invention, a cutting oil injector installed in the first tank is installed.
Figure 3 is another embodiment of the present invention, a circuit diagram of a cutting oil filtering device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a circuit diagram of a cutting oil filtering device according to an embodiment of the present invention. Figure 2 is an embodiment of the present invention, a cutting oil injector installed in the first tank (10) is installed.

1 and 2 , the cutting oil filtering device of this embodiment includes a first tank 10 through which the cutting oil containing fine chips from the machine tool processing area is introduced through the inlet 11 .

At this time, the fine chips contained in the cutting oil have high hardness, such as ceramic, glass, and quartz, and the particle size is very small, so the size is not filtered by the cutting oil filter of a general chip processing device for metal processing.

The first tank 10 is provided with an injection pump 12 for spraying the stored cutting oil at a constant pressure. A discharge pipe 13 is connected to the discharge port of the injection pump 12, and the cutting oil discharged from the injection pump 12 is supplied to the discharge pipe 13 as shown in FIG. 2 in the first tank 10. A plurality of injection nozzles 14 are installed adjacent to the bottom surface of the first tank 10 so as to float the fine chips deposited on the bottom of the first tank 10 by spraying the cutting oil stored in the .

In addition, a cyclone pump 15 for supplying the stored cutting oil to the cyclone filter 16 is installed in the first tank 10 . The cyclone filter 16 separates particles contained in the cutting oil supplied from the cyclone pump 15 in a centrifugal separation method and discharges them to the particle collector 17, and also the cyclone filter 16 The cutting oil from which the particles are filtered is supplied to the second tank 20 through the pipe 18 .

On the other hand, the suction port of the injection pump 12 is installed at a position spaced apart from the coolant inlet 11 so that the fine chips flowing in from the inlet 11 are minimally sucked. In this way, when the suction port of the injection pump 12 is installed at a position spaced apart from the coolant inlet 11, the fine chips contained in the coolant flowing in the vicinity of the coolant inlet 11 can be accumulated more than other parts, and these micro This is because the chips may be introduced into the injection pump 12 to accelerate the wear of the injection pump 12 .

An oil separation pump 21 for discharging the stored cutting oil at a constant pressure is installed in the second tank 20 . An oil filter 22 for separating the oil contained in the cutting oil is installed in the pipe 18 on the discharge port side of the oil separation pump 21 . A drain tank 23 from which the oil separated from the oil filter 22 is discharged is connected to the oil filter 22 , and a pipe 18 is provided so that the cutting oil from which the oil is separated is supplied to the third tank 30 . Connected.

On the other hand, at the inlet side of the oil filter 22 , when the pressure of the cutting oil supplied from the oil separation pump 21 exceeds a predetermined pressure, a portion of the cutting oil supplied from the oil separation pump 21 is applied to the second A first drain valve 24 for discharging to the tank 20 is installed.

In addition, a second drain valve 25 for draining the cutting oil therein to the second tank 20 is installed at the bottom of the oil filter 22 . The second drain valve 25 functions to drain the cutting oil inside the oil filter 22 when it is necessary to remove the cutting oil inside the oil filter 22 , such as replacing the filter.

A ceramic transfer pump 31 for discharging the stored cutting oil at a constant pressure is installed in the third tank 30 . A ceramic filter 32 having a membrane structure that filters fine mineral particles of a size that is not filtered by the cyclone filter 16 is installed in the pipe 18 on the discharge port side of the ceramic transfer pump 31 .

A pipe 18 is connected to the outlet side of the ceramic filter 32 so that the cutting oil that has passed through the ceramic filter 32 is supplied to the fourth tank 40 . A pressure gauge 33 for detecting the pressure of the cutting oil sent to the ceramic filter 32 is installed on the pipe 18 connecting the ceramic filter 32 and the fourth tank 40 . In addition, on the pipe 18 connecting the ceramic filter 32 and the fourth tank 40, a solenoid-driven switching valve 34 for controlling the flow of cutting oil supplied to the fourth tank 40, A flow meter 35 for detecting the flow rate of the cutting oil on the pipe 18 is provided.

Meanwhile, a branch pipe 36 connected to the fourth tank 40 is installed on the pipe 18 between the ceramic filter 32 and the switching valve 34 , and the branch pipe 36 is disposed on the branch pipe 36 . A backwash pump 37 for supplying cutting oil from the fourth tank 40 to the outlet of the ceramic filter 32 is installed.

In addition, one side of the ceramic filter 32 is supplied from the backwash pump 37 to flow back from the ceramic filter 32 or supplied from the ceramic transfer pump 31 to exceed the capacity of the ceramic filter 32 . A backwash pipe 38 is installed so that one cutting oil is discharged to the first tank 10 or the third tank 30 .

On the backwash pipe 38 , the cutting oil is supplied from the backwash pump 37 and flows backward through the ceramic filter 32 to discharge the cutting oil into the first tank 10 . ) direction, and when the backwash pump 37 is not operating, the cutting oil exceeding the capacity of the ceramic filter 32 is discharged in the third tank 30 direction. Install the solenoid driven three-way valve (39) to be.

Meanwhile, in another embodiment, as shown in FIG. 3 , the backwash pipe 38 is connected only to the third tank 30 without installing the three-way valve 39 on the backwash pipe 38 . can This is because, when the backwash pump 37 is operated, even if the fine chips adsorbed on the ceramic filter 32 are discharged together with the cutting oil discharged through the ceramic filter 32 backflow, these fine chips are already in the first tank 10 . Since the size is passed through the cyclone filter 16 and the oil filter 22 of the second tank 20, the cyclone filter 16 and the oil filter 22 are discharged to the first tank 10 again. Because there is no need to let it pass.

Meanwhile, a cutting oil pump 41 is installed in the fourth tank 40 to supply the cutting oil that has passed through the ceramic filter 32 to the machine tool processing area through the pipe 18 .

Looking at the operation process of the cutting oil filtering device of this embodiment configured as described above, the hardness is high, such as ceramic, glass, quartz, etc. from the machine tool processing area, and the particle size is very small. The cutting oil flows into the first tank 10 through the inlet 11 . The introduced fine chips may be deposited on the bottom of the first tank 10 due to the oil component contained in the cutting oil and accumulated in the form of a sticky mass.

At this time, the injection pump 12 operates to suck in the cutting oil introduced together with the fine chips and spray it through the discharge pipe 13 and the injection nozzle 14 arranged in a grid at the bottom of the first tank 10 . Through this injection, a vortex is formed in the cutting oil inside the first tank 10, so that the fine chips introduced with the cutting oil are mixed with the cutting oil instead of being accumulated as a sticky sediment to maintain a flow state.

The cyclone pump 15 disposed in the first tank 10 sucks this cutting oil and supplies it to the cyclone filter 16, and the cyclone filter 16 uses centrifugal force due to high-speed rotation to remove fine chip particles. It is separated and discharged to the particle collector 17 installed below, and the filtered cutting oil is supplied to the second tank 20 through the pipe 18 .

The cutting oil supplied to the second tank 20 is supplied to the oil filter 22 by the operation of the oil separation pump 21 . The oil filter 22 separates the oil contained in the cutting oil and agglomerates the fine chips and discharges it to the drain tank 23, and the cutting oil from which the oil is separated is supplied to the third tank 30 through the connected pipe 18. .

Meanwhile, a shut-off valve 26 is installed between the oil filter 22 and the drain tank 23 to block or open the oil flow path discharged from the oil filter 22 to the drain tank 23 . Such a shut-off valve 26 can be selectively installed when there is a space for collecting the separated oil inside the oil filter 22, and in some cases, the installation is omitted so that the separated oil is always stored in the drain tank 23. It can also be discharged as

On the other hand, a pressure gauge 33 and a first drain valve 24 for returning the cutting oil supplied from the oil separation pump 21 to the second tank 20 are installed at the inlet side of the oil filter 22, When the pressure of the cutting oil supplied from the oil separation pump 21 exceeds a predetermined pressure to the extent that the oil cannot be normally separated from the oil filter 22, the degree of opening of the first drain valve 24 is adjusted to part of the cutting oil flowing into the oil filter 22 is returned to the second tank 20 .

Through this, it is possible to adjust the oil filter 22 so that only an appropriate cutting oil is introduced in consideration of the oil separation capacity.

On the other hand, the oil filter 22 requires replacement of the filter due to continuous use. At this time, the second drain valve 25 installed at the bottom of the oil filter 22 is opened to discharge the cutting oil accumulated in the oil filter 22 to the second tank 20, and then the oil filter 22 is replaced. Increase the convenience of work.

Next, the cutting oil from which the oil is separated is supplied to the ceramic filter 32 through the ceramic transfer pump 31 in a state in which the oil is collected in the third tank 30 . At this time, mineral fine particles that are not filtered by the cyclone filter 16 remain in the cutting oil. The ceramic filter 32 filters these fine particles with a fine filter having a membrane structure. The cutting oil from which the fine particles have been filtered becomes reusable in the machining area of the machine tool with fine chips and oil removed, and is supplied to the fourth tank 40 .

On the other hand, the ceramic filter 32 is gradually clogged by the fine particles as the filtration time is accumulated, and its performance is deteriorated. As such, when the performance of the ceramic filter 32 is deteriorated due to clogging, the amount of cutting oil discharged to the fourth tank 40 through the ceramic filter 32 is reduced, and the amount of this cutting oil is measured by a flow meter installed on the pipe 18 . It is detected by 35 and provided to a control unit (not shown).

When the flow rate of the flow meter 35 is less than a predetermined flow rate, the control unit determines that the function of the ceramic filter 32 is deteriorated because the fine chips are adsorbed to the ceramic filter 32 , and the ceramic filter 32 is discharged. The supply of cutting oil supplied from the ceramic filter 32 to the fourth tank 40 is blocked by switching the switching valve 34 installed on the pipe 18 .

At the same time, the control unit operates the backwash pump 37 to supply the purified cutting oil stored in the fourth tank 40 to the outlet side of the ceramic filter 32 . The cutting oil supplied to the ceramic filter 32 passes through the ceramic filter 32 at a constant pressure in the counterflow direction to remove the fine particles adsorbed on the ceramic filter 32, and passes through the backwash pipe 38 to the first tank ( 10) performs the function of backwashing.

On the other hand, when the backwash pump 37 is operated, the control unit switches the direction of the three-way valve 39 installed on the backwash pipe 38 so that the cutting oil passing through the backwash pipe 38 flows into the first tank 10 ), and when the backwash pump 37 is not in operation, the cutting oil that overflows without passing through the ceramic filter 32 exceeds the filtration capacity in the ceramic filter 32 is drained into the third tank 30. The direction of the three-way valve 39 is switched to the third tank 30 direction.

Meanwhile, in another embodiment, as shown in FIG. 3 , the backwash pipe 38 is connected only to the third tank 30 without installing the three-way valve 39 on the backwash pipe 38 . can Whether this is cutting oil that overflows without passing through the ceramic filter 32 because it exceeds the filtration capacity of the ceramic filter 32, as the backwash pump 37 operates, the ceramic filter 32 flows back and the adsorbed fine chips are together. Regardless of whether the coolant is discharged, the fine chips contained in the coolant at this time have already passed through the cyclone filter 16 of the first tank 10 and the oil filter 22 of the second tank 20, so It is also possible to discharge directly to the third tank 30 without the need for discharging to the first tank 10 to pass through the cyclone filter 16 and the oil filter 22 again.

On the other hand, by installing a shut-off valve 26 on the branch pipe 36 where the backwash pump 37 is installed, when the backwash function is not used, the branch pipe 36 is maintained in a blocked state to prevent the ceramic filter 32 from being installed. The cutting oil is supplied to the fourth tank 40 only through the pipe 18 in which the flow meter 35 is installed.

In addition, in the backwash operation as described above, the switching valve 34 is switched only for a predetermined period of time through the control unit, the backwash pump 37 is operated, and the three-way valve 39 is moved to the first tank 10 . Limit the operating time to change the direction

In this way, when the ceramic filter 32 is clogged by the fine chips, the replacement cycle of the ceramic filter 32 can be extended by removing the fine chips adsorbed to the ceramic filter 32 through a backwash operation that reverses the filtered cutting oil. have.

Meanwhile, the height h1 of the bulkhead of the first tank 10 is lower than the height h2 of the bulkhead of the adjacent second tank 20, and the height h2 of the bulkhead of the second tank 20 is The height h3 of the bulkhead of the adjacent third tank 30 is lower than the height h3 of the bulkhead of the third tank 30 is lower than the height h4 of the bulkhead of the adjacent fourth tank 40 . By forming, the coolant in the unfiltered tank does not overflow into the filtered tank, but overflows into the unfiltered tank below when the capacity of the filtered coolant overflows. Therefore, it is possible to minimize the installation area of the coolant filtering device by minimizing the floor area of all coolant tanks, while preventing contamination of the filtered coolant with unfiltered coolant.

On the other hand, by ensuring that the total amount of cutting oil used in the machine tool does not exceed the total capacity of the first, second, and third tanks 10, 20, 30, and 40, even if the cutting oil overflows from the fourth tank 40 The cutting oil is prevented from flowing out of the first tank 10 .

As described above, the present invention can effectively filter fine chips with high hardness, such as glass or quartz, in cutting oil to prevent internal wear of the machine tool due to the penetration of the fine chips.

In addition, the present invention minimizes the installation area of the filtration device.

In addition, the present invention can extend the life of the ceramic filter 32 as well as implement a fine chip filtering device without clogging.

10 first tank
11 inlet
12 injection pump
13 Outgoing pipe
14 spray nozzle
15 Cyclone Pump
16 Cyclone Filter
17 Particle Collector
18 plumbing
20 second tank
21 Oil Separation Pump
22 oil filter
23 drain tank
24 1st drain valve
25 2nd drain valve
26 shut-off valve
30 third tank
31 Ceramic Transfer Pump
32 Ceramic filter
33 pressure gauge
34 selector valve
35 flow meter
36 branch pipe
37 Backwash Pump
38 Backwash Piping
39 three-way valve
40 4th tank
41 coolant pump

Claims (12)

a first tank for storing cutting oil recovered from the machining area of the machine tool;
a cyclone pump for supplying the cutting oil stored in the first tank to a cyclone filter;
a cyclone filter for centrifuging and discharging particles contained in the cutting oil supplied from the cyclone pump;
a second tank receiving cutting oil from which particles are filtered from the cyclone filter;
an oil separation pump for discharging the stored cutting oil to the second tank;
an oil filter for separating and discharging oil contained in the cutting oil supplied from the oil separation pump;
a third tank receiving cutting oil from which oil is separated from the oil filter;
a ceramic transfer pump for discharging the stored cutting oil to the third tank;
a ceramic filter having a membrane structure for filtering fine particles contained in the cutting oil supplied from the ceramic transfer pump;
A cutting oil fine chip filtering device for a machine tool including a fourth tank in which a cutting oil pump for supplying the cutting oil that has passed through the ceramic filter to the machine tool processing area is installed. According to claim 1, wherein the injection pump for discharging the cutting oil stored in the first tank;
A plurality of injection nozzles installed adjacent to the bottom surface of the first tank for spraying the cutting oil discharged from the injection pump to the cutting oil stored in the first tank and floating to prevent fine chips from settling on the bottom of the first tank. Coolant fine chip filtering device of the machine tool further comprising. According to claim 2, wherein the suction port of the injection pump is a cutting oil fine chip filtering device for a machine tool, characterized in that it is installed at a position spaced apart from the cutting oil inlet. The method according to claim 1, wherein a switching valve for intermittent flow of cutting oil and a flow meter for detecting the flow rate of cutting oil are installed on a pipe connected from the ceramic filter to the fourth tank, and the outlet pipe of the ceramic filter is provided with the second tank. A backwash pump is installed that supplies the coolant from the fourth tank in the reverse flow direction of the ceramic filter and discharges it to the coolant tank upstream from the fourth tank through the backwash pipe, and the flow rate of the coolant detected through the flow meter is determined in advance. When the flow rate is less than the flow rate, the switching valve is closed to prevent the supply of cutting oil to the fourth tank, and at the same time, a control unit for operating the backwash pump. 5. The method of claim 4, wherein, on the backwash pipe, when the backwash pump is operated by the control unit, the coolant flowing backward through the ceramic filter is switched to be discharged to the first tank, and when the backwash pump is not operated Cutting oil fine chip filtering device for a machine tool, characterized in that a three-way valve is installed to drain the coolant that overflows without passing through the ceramic filter in excess of the filtration capacity of the ceramic filter to the third tank. [Claim 5] The cutting oil fine chip filtering device of a machine tool according to claim 4, wherein the backwash pipe is connected to the third tank. 5. The method of claim 4, wherein the control unit closes the selector valve only for a predetermined time when the flow rate of the cutting oil detected through the flow meter is less than the predetermined flow rate, operates the backwash pump, and operates the three-way valve. Cutting oil fine chip filtering device of a machine tool, characterized in that it is switched in the direction of the first tank. The cutting oil microchip of a machine tool according to claim 1, wherein a drain tank from which the oil separated from the oil filter is discharged is installed in the oil filter, and a shut-off valve is installed between the oil filter and the drain tank. filtration device. The method of claim 1 , wherein a portion of the cutting oil supplied to the oil separation pump is discharged to the second tank when the pressure of the cutting oil supplied from the oil separation pump exceeds a predetermined pressure at the inlet side of the oil filter. 1 Coolant fine chip filtering device for machine tools, characterized in that a drain valve is installed. The cutting oil fine chip filtering device for a machine tool according to claim 1, wherein a second drain valve for draining the cutting oil inside the oil filter into the second tank is installed at the bottom of the oil filter. The cutting oil fine chip filtering device for a machine tool according to claim 1, wherein a pressure gauge for detecting the pressure of the cutting oil is installed on the pipe between the ceramic filter and the fourth tank. According to claim 1, wherein the height (h1) of the bulkhead of the first tank adjacent to the second tank is lower than the height (h2) of the bulkhead of the second tank adjacent to the second tank, and the height of the second tank adjacent to the third tank. The height h2 of the bulkhead is lower than the height h3 of the bulkhead of the adjacent third tank, and the height h3 of the bulkhead of the third tank adjacent to the fourth tank is the height of the bulkhead of the adjacent fourth tank ( h4) The cutting oil fine chip filtering device of the machine tool, characterized in that formed lower than.

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